Product comparison · 2 nas & storage servers

QNAP TS-251C NAS/storage server Tower Intel® Celeron® vs QNAP TS-851-4G + 2X 0S03674

62specifications compared
24differ
38identical
16known for one product only

Key differences

Storage drives installed
- TS-251C NAS/storage server Tower Intel® Celeron®:No
- TS-851-4G + 2X 0S03674:Yes
Total installed storage capacity
- TS-251C NAS/storage server Tower Intel® Celeron®:0 TB
- TS-851-4G + 2X 0S03674:24 TB
Number of storage drives installed
- TS-251C NAS/storage server Tower Intel® Celeron®:0
- TS-851-4G + 2X 0S03674:8
Number of storage drives supported
- TS-251C NAS/storage server Tower Intel® Celeron®:2
- TS-851-4G + 2X 0S03674:8
Storage drive capacity
- TS-251C NAS/storage server Tower Intel® Celeron®:0 GB
- TS-851-4G + 2X 0S03674:3 TB
Storage drive size
- TS-251C NAS/storage server Tower Intel® Celeron®:3.5"
- TS-851-4G + 2X 0S03674:2.5/3.5"
RAID levels
- TS-251C NAS/storage server Tower Intel® Celeron®:0, 1
- TS-851-4G + 2X 0S03674:0, 1, 5, 6, 10, JBOD
Hot-swap drive bays
- TS-251C NAS/storage server Tower Intel® Celeron®:No
- TS-851-4G + 2X 0S03674:Yes

Side by side

Differences highlightedShow differences only

Comparison of TS-251C, TS-851-4G + 2X 0S03674
78 specifications	A QNAP TS-251C NAS/storage server Tower Intel® Celeron® Model TS-251C View product	B QNAP TS-851-4G + 2X 0S03674 View product
Storage9 differ
Storage drives installedDiffers	No	Yes
Total installed storage capacityDiffers	0 TB	24 TB
Number of storage drives installedDiffers	0	8
Number of storage drives supportedDiffers	2	8
Installed storage drive type	HDD	HDD
Supported storage drive types	HDD & SSD	HDD & SSD
Storage drive capacityDiffers	0 GB	3 TB
Storage drive interfaceDiffers	Serial ATA III	Serial ATA II, Serial ATA III
Storage drive sizeDiffers	3.5"	2.5/3.5"
RAID support	Yes	Yes
RAID levelsDiffers	0, 1	0, 1, 5, 6, 10, JBOD
Hot-swap drive baysDiffers	No	Yes
Supported file systems	ext3, ext4, FAT32, HFS+, NTFS	ext3, ext4, FAT32, HFS+, NTFS
Processoridentical
Processor family	Intel® Celeron®	Intel® Celeron®
Processor frequency	2.41 GHz	2.41 GHz
Processor cores	2	2
Number of processors installedKnown for one	1	Unknown — not stated by the source
Memory1 differ
Internal memoryDiffers	1 GB	4 GB
Internal memory type	DDR3L	DDR3L
Flash memory	512 MB	512 MB
Maximum RAM supportedKnown for one	Unknown — not stated by the source	8 GB
Memory slotsKnown for one	Unknown — not stated by the source	2
Network1 differ
Ethernet LAN	Yes	Yes
Ethernet LAN data ratesDiffers	1000 Mbit/s	10,100,1000 Mbit/s
Wi-Fi	No	No
DHCP client	Yes	Yes
DHCP server	Yes	Yes
Jumbo frames support	Yes	Yes
iSCSI support	Yes	Yes
Wake-on-LAN ready	Yes	Yes
Supported network protocols	CIFS/SMB, AFP (v3.3), NFS(v3), FTP, FTPS, SFTP, TFTP, HTTP(S), Telnet, SSH, iSCSI, SNMP, SMTP, SMSC	CIFS/SMB, AFP (v3.3), NFS(v3), FTP, FTPS, SFTP, TFTP, HTTP(S), Telnet, SSH, iSCSI, SNMP, SMTP, SMSC
Ports & interfaces2 differ
Ethernet LAN (RJ-45) portsDiffers	1	2
USB 2.0 ports quantity	2	2
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantityDiffers	1	3
Fiber ports quantity	0	0
HDMI ports quantity	1	1
Design4 differ
Chassis type	Tower	Tower
Cooling type	Active	Active
Product colourDiffers	White	Black
Number of fansDiffers	1 fan(s)	2 fan(s)
Fan diameterDiffers	6 cm	12 cm
LED indicatorsDiffers	HDD, LAN, Power, Status, USB	Yes
Built-in displayKnown for one	No	Unknown — not stated by the source
Cable lock slot	Yes	Yes
Cable lock slot type	Kensington	Kensington
Performance1 differ
Type	NAS	NAS
Device class	Home & Home Office	Home & Home Office
Backup function	Yes	Yes
Backup featuresKnown for one	Cloud, iSCSI LUN	Unknown — not stated by the source
BuzzerKnown for one	Yes	Unknown — not stated by the source
Multilingual supportKnown for one	Yes	Unknown — not stated by the source
Web-based management	Yes	Yes
Access Control List (ACL)	Yes	Yes
On/off switch	Yes	Yes
Reset button	Yes	Yes
Security algorithmsDiffers	256-bit AES, FIPS 140-2, HTTPS, SSH, SSL/TLS	FIPS 140-2, HTTPS, SSH, SSL/TLS
Management protocolsKnown for one	Unknown — not stated by the source	SNMP, Telnet
Softwareidentical
Operating system installed	QNAP Turbo System	QNAP Turbo System
Operating system version	4.1	4.1
Power2 differ
Power supply locationDiffers	External	Built-in
Power supply unit (PSU) capacityDiffers	60 W	350 W
Number of power supply units	1	1
Power consumption (typical)Known for one	15.71 W	Unknown — not stated by the source
Power consumption (sleep)Known for one	0.7 W	Unknown — not stated by the source
AC input voltage	100-240 V	100-240 V
AC input frequency	50 - 60 Hz	50 - 60 Hz
Fan voltageKnown for one	Unknown — not stated by the source	12 V
Weight & dimensions3 differ
WidthDiffers	85 mm	298.2 mm
DepthDiffers	218.4 mm	235.4 mm
HeightDiffers	166.5 mm	185.2 mm
WeightKnown for one	3.16 kg	Unknown — not stated by the source
Packaging content1 differ
External power adapterKnown for one	Yes	Unknown — not stated by the source
Cables includedDiffers	AC, LAN (RJ-45), SATA	AC, LAN (RJ-45)
Quick installation guide	Yes	Yes
Operational conditionsidentical
Operating temperature (T-T)	0 - 40 °C	0 - 40 °C
Storage relative humidity (H-H)Known for one	5 - 95%	Unknown — not stated by the source
Operating relative humidity (H-H)Known for one	Unknown — not stated by the source	5 - 95%
Other featuresidentical
Digital Living Network Alliance (DLNA) certifiedKnown for one	Unknown — not stated by the source	Yes

A dash means the value is not stated by the source. Unknown values are never counted for or against a product, and there is no overall score.

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